Sentence Correction

The particular design of muscles and bones in the neck and limbs of the turtle allow
that it can draw in its exposed parts such that an attacker can find nothing
but hard shell to bite.
A. allow that it can draw in its exposed parts such that
B. allow it to draw in its exposed parts, and so
C. allows for it to draw in its exposed parts and that
D. allows that it can draw in its exposed parts, and so
E. allows it to draw in its exposed parts, so that

i think the answer should be e but it is given as d

kindly help

sameerbhagwatmba1 wrote:
i think the answer should be e but it is given as d

so that is wrong in GMAT ... it shoud be so X that Y.
But I don't know why D is correct option

D Is correct as E has some Pronoun ambiguity

in E : " allows to " can refer to both Turtle and design of..but in d it only can refers to turtle as " allows that it can/" means " design allows that turtle can..."

Hope i m clear

But doesnt "it" refer to the first noun while moving backwards? In that case it will be correctly pointing to turtle

IMO: E
Allows - singular ( right)
Allows to ...., right idiom

B ( allow - Plural - incorrect verb use)
others - incorrect idiom ( allow)